/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package sgt.supermarket.controller.product;

import java.io.IOException;
import java.util.Date;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sgt.supermarket.controller.XServlet;
import sgt.supermarket.entity.Product;
import sgt.supermarket.entity.ProductBlock;
import sgt.supermarket.entity.Shrinkage;
import sgt.supermarket.hibernatedao.HibernateDAOFactory;
import sgt.supermarket.util.ServletExtensions;

/**
 *
 * @author Administrator
 */
public class ViewShrinkage extends XServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HibernateDAOFactory factory = new HibernateDAOFactory();
        Product product = factory.getProductDAO().getById(ServletExtensions.getLongParam(request, "pid"));
        if (request.getMethod().equalsIgnoreCase("POST")) {
            if (request.getParameter("calc") != null) {
                double physicalQuantity = ServletExtensions.getIntParam(request, "physicalQuantity");
                double diff = product.getTotalAvailable() - physicalQuantity;
                if (diff > 0) {
                    List<ProductBlock> blocks = factory.getProductBlockDAO().getAvailablesByProductId(product.getAutoId());
                    int index = blocks.size() - 1;
                    while (diff > 0) {
                        ProductBlock block = blocks.get(index);
                        Shrinkage s;
                        if (block.getAvailableUnits() >= diff) {
                            s = new Shrinkage(diff, block.getCost(), new Date());
                            diff = 0;
                        } else {
                            s = new Shrinkage(block.getAvailableUnits(), block.getCost(), new Date());
                            diff = diff - s.getUnits();
                        }
                        product.addShrinkage(s);
                        block.setAvailableUnits(block.getAvailableUnits() - s.getUnits());
                    }
                    factory.getProductDAO().save(product);
                }
            }
        }
        request.setAttribute("title", "View shrinkage: " + product.getName());
        request.setAttribute("product", product);
        request.getRequestDispatcher("/product.viewShrinkage.tiles").forward(request, response);
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
